公开(公告)号：US20150304814A1

公开(公告)日：2015-10-22

申请号：US14258104

申请日：2014-04-22

Applicant: Cisco Technology Inc.

Inventor： Santosh Pandey ,  Brian D. Hart ,  Shaunak Joshi ,  David Kloper ,  Donald R. Peoples

IPC: H04W4/02 ,  H04W56/00

CPC classification number: H04W4/023 ,  H04W48/16 ,  H04W56/001 ,  H04W64/003

Abstract: A wireless receiver (e.g., access point (AP)) is a member of a group of a plurality of receivers in a wireless local area network and time synchronized with other receivers in the group. A channel scan list is generated from a plurality of wireless channels available in one or more frequency bands. A channel is selected for the receiver to monitor from the channel scan list based on a current time at the receiver such that each of the plurality of receivers in the group are scanning the same channel at the same time. The selected channel is scanned and signal characteristic information (e.g., received signal strength (RSS)) is generated for the signals received during a given scan duration.

Abstract translation: 无线接收器（例如，接入点（AP））是无线局域网中的多个接收机的组的成员，并且与该组中的其他接收机同步的时间。 从一个或多个频带中可用的多个无线信道生成频道扫描列表。 基于接收机当前的时间，从频道扫描列表中选择频道以使接收机监视，使得组中的多个接收机中的每一个同时扫描相同的频道。 扫描所选择的信道，并且在给定的扫描持续时间内为接收到的信号生成信号特征信息（例如，接收信号强度（RSS））。

公开(公告)号：US09055449B2

公开(公告)日：2015-06-09

申请号：US13691912

申请日：2012-12-03

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Jeffrey R. Adams ,  David Kloper ,  Yanxin Na ,  Narayan Vishwanathan ,  Daniel Wee

IPC: H04B1/00 ,  H04B15/00 ,  H04W16/28

CPC classification number: H04W16/28 ,  H04B7/0626 ,  H04B7/0634

Abstract: A channel sounding scheme is presented herein that relies on a combination of a first channel sounding procedure and a second channel sounding procedure. The first channel sounding technique is one that involves an exchange of dedicated channel sounding related signals to determine channel conditions between the first wireless communication device and the particular second wireless communication device. The second channel sounding technique is one in which channel conditions are implicitly discovered from any signals transmitted by the particular second wireless communication device to the first wireless communication device. A first wireless communication device computes updates to steering matrix information used for beamforming one or more signal streams to a particular second wireless communication device based on a combination of the first channel sounding technique and the second channel sounding technique.

Abstract translation: 此处呈现依赖于第一声道探测程序和第二声道探测程序的组合的声道探测方案。 第一通道探测技术是涉及专用信道探测相关信号的交换以确定第一无线通信设备和特定第二无线通信设备之间的信道状况的技术。 第二信道探测技术是从特定的第二无线通信设备向第一无线通信设备发送的任何信号隐含地发现信道条件的方法。 第一无线通信设备基于第一信道探测技术和第二信道探测技术的组合，计算用于将一个或多个信号流波束成形到特定第二无线通信设备的导引矩阵信息的更新。

公开(公告)号：US20150085958A1

公开(公告)日：2015-03-26

申请号：US14037807

申请日：2013-09-26

Applicant: Cisco Technology, Inc.

Inventor： Zhigang Gao ,  Raghuram Rangarajan ,  David Kloper

IPC: H04L25/06

CPC classification number: H04L25/063

Abstract: Techniques are presented herein for distinguishing between the DC component of a real signal and DC energy of a received signal due to the radio receiver circuitry. Samples are obtained of a received signal derived from output of a receiver of a communication device. A mean of the samples is computed over a sample window comprising a predetermined number of samples. First and second thresholds are provided, the first threshold being greater than the second threshold. An absolute value of the mean is compared with respect to the first threshold and the second threshold as samples are obtained in the sample window. A selection is made between the first threshold and the second threshold for purposes of comparison with the absolute value of the mean to determine whether energy at DC is a true/real DC component of the received signal or is due to circuitry of the receiver.

Abstract translation: 这里给出了用于区分由无线电接收器电路引起的实际信号的DC分量和接收信号的DC能量之间的技术。 获得从通信设备的接收机的输出得到的接收信号的样本。 在包含预定数量的样本的样本窗口上计算样本的平均值。 提供第一和第二阈值，第一阈值大于第二阈值。 将平均值的绝对值相对于第一阈值和第二阈值进行比较，因为样本窗口中获取样本。 在第一阈值和第二阈值之间进行选择，以便与平均值的绝对值进行比较，以确定DC处的能量是否是接收信号的真实/真实DC分量，或者是由于接收机的电路。

公开(公告)号：US20150056936A1

公开(公告)日：2015-02-26

申请号：US13973496

申请日：2013-08-22

Applicant: Cisco Technology, Inc.

Inventor： Raghuram Rangarajan ,  David Kloper ,  Paul J. Stager

IPC: H04B7/08

CPC classification number: H04B7/0817 ,  H03G3/3078

Abstract: A set of receiver path circuits is allocated for processing a radio-frequency (RF) signal provided by receive antennas coupled to the receiver path circuits. The RF signal may belong to a first signal class, such as Wi-Fi. A first gain control signal is applied to each of the allocated receiver path circuits to condition a signal level of the RF signal for the first signal class. A second gain control signal is applied to another set of receiver path circuits coupled to the receive antennas to condition the RF signal of a second signal class. First receive gain control signals are generated from the RF signals of the first signal class by the allocated set of the receiver path circuits. The first receive gain control signals are configured to optimize the signal level for processing the first signal class. A second receive gain control signal is generated to optimize the signal level of the RF signal for the second signal class.

Abstract translation: 分配一组接收机路径电路来处理由耦合到接收机路径电路的接收天线提供的射频（RF）信号。 RF信号可以属于第一信号类，例如Wi-Fi。 对每个分配的接收机路径电路施加第一增益控制信号，以便调节第一信号类的RF信号的信号电平。 第二增益控制信号被施加到耦合到接收天线的另一组接收器路径电路以调节第二信号类的RF信号。 第一接收增益控制信号由所分配的一组接收机路径电路从第一信号类的RF信号产生。 第一接收增益控制信号被配置为优化用于处理第一信号类的信号电平。 生成第二接收增益控制信号以优化第二信号类的RF信号的信号电平。

公开(公告)号：US20140328247A1

公开(公告)日：2014-11-06

申请号：US13874657

申请日：2013-05-01

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Matthew A. Silverman ,  Paul J. Stager ,  David Kloper

IPC: H04L25/02

CPC classification number: H04L25/0228 ,  H04L25/0204

Abstract: A first device explicitly sounds a wireless channel with respect to a second device even when the second device cannot sound all the antenna/transmit paths of the first device. The first device has a first plurality of antennas and corresponding transmitters and the second device has a second plurality antennas and corresponding receivers. The first device wirelessly transmits a plurality of sounding frames to the second device such that at least one of the first plurality of antennas is kept constant across the plurality of sounding frames. The first device receives from the second device at least one feedback message containing channel matrix information derived from reception of the sounding frames at the second plurality of antennas of the second device. The first device derives a full wireless channel estimate between the first plurality of antennas of the first device and the second plurality of antennas of the second device.

Abstract translation: 即使当第二设备不能听到第一设备的所有天线/发射路径时，第一设备也明确地听到关于第二设备的无线信道。 第一设备具有第一多个天线和对应的发射机，并且第二设备具有第二多个天线和对应的接收机。 第一设备将多个探测帧无线发射到第二设备，使得第一多个天线中的至少一个天线在多个探测帧之间保持恒定。 所述第一设备从所述第二设备接收包含从所述第二设备的第二多个天线处的所述探测帧的接收导出的信道矩阵信息的至少一个反馈消息。 第一设备在第一设备的第一多个天线和第二设备的第二多个天线之间导出完整的无线信道估计。

公开(公告)号：US20140327579A1

公开(公告)日：2014-11-06

申请号：US13886533

申请日：2013-05-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Silverman

IPC: G01S3/38

CPC classification number: G01S3/38 ,  G01S1/68 ,  G01S3/48 ,  H04W64/006

Abstract: In one embodiment, an apparatus includes a plurality of antennas, a receiver in communication with said plurality of antennas for receiving one or more packets in a block based modulation environment, a switch interposed between a portion of the antennas and the receiver for switching between the antennas, and a processor for calculating angle of arrival for use in identifying a location of a mobile device transmitting the one or more packets.

Abstract translation: 在一个实施例中，一种装置包括多个天线，与所述多个天线通信的接收机，用于在基于块的调制环境中接收一个或多个分组，插入在天线的一部分和接收机之间用于在 天线和用于计算到达角的处理器，用于识别发送一个或多个分组的移动设备的位置。